Sacral cysts, scientifically called dural cysts, usually originate in the periaqueduct of the spinal cord, which is actually a cystic, hydrosphere-like tissue that appears in the spinal canal or in the spinal cord. In some cases, it is congenital or acquired later in life. In general, it is a cystic, not a tumor, and is not benign or malignant. In terms of clinical symptoms, if there is no spinal nerve fiber adhesion or compression, it does not cause significant clinical symptoms. If there are also spinal nerve fibers or compression, there will be corresponding clinical symptoms, such as sensory and motor disorders in the inner thighs and perineal area, and some people will experience chronic pain and discomfort in the lumbar, caudal and perineal areas, and even urinary and fecal incontinence, which will affect their activities. At present, the examination method is basically CT examination combined with nuclear magnetic examination. CT examination is mainly to check whether there is bone destruction and occupying effect, and nuclear magnetic examination is mainly to see the relationship between cystic changes and peripheral nerves. The disease of sacral cyst, mainly early detection and early treatment, can achieve a very good prognosis, and this disease is not malignant, so do not worry too much.